256808219 has 2 divisors, whose sum is σ = 256808220. Its totient is φ = 256808218.

The previous prime is 256808213. The next prime is 256808243. The reversal of 256808219 is 912808652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256808219 - 2⁴ = 256808203 is a prime.

It is a super-2 number, since 2×256808219² = 131900922691903922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256808213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128404109 + 128404110.

It is an arithmetic number, because the mean of its divisors is an integer number (128404110).

Almost surely, 2^256808219 is an apocalyptic number.

256808219 is a deficient number, since it is larger than the sum of its proper divisors (1).

256808219 is an equidigital number, since it uses as much as digits as its factorization.

256808219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 256808219 is about 16025.2369405260. The cubic root of 256808219 is about 635.6279311514.

The spelling of 256808219 in words is "two hundred fifty-six million, eight hundred eight thousand, two hundred nineteen".